The head of Vatican security said Islamic State militants have threatened the Vatican, but there are no indications of any planned attack.

The Vatican gendarmes, Swiss Guards and the Italian state police that patrol the perimeter of Vatican City State are always on high alert, said Domenico Giani, the commander of the gendarme and the pope's chief bodyguard.

Profit must never be a Christian's god, although it is one of the tools for measuring the effectiveness of business choices and the ability of a company to help workers feed their families, Pope Francis said.

"Money is the devil's dung," the pope said Saturday, quoting St. Francis of Assisi. "When money becomes an idol, it dictates people's choices."

A cookbook featuring favorite dishes of the three most-recent popes and their elite military corps will be available this summer in English.

Buon Appetito, Swiss Guard was written by 24-year-old David Geisser, who had worked as a chef and published two popular cookbooks in his native Switzerland before joining the Swiss Guard nearly two years ago.

"Many people do not know about the Swiss Guard," said Geisser, whose commander conceived of the coffee-table-size book as a means to make the Guard better known.

A private email from Pope Francis to a personal friend was never meant to offend Mexican sensibilities, the Vatican said in a statement after the message -- which suggested Mexico was synonymous with drugs and violence -- was made public.